Statistics – Computation
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...183..392f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 183, no. 2, Sept. 1987, p. 392-396.
Statistics
Computation
6
Comet Nuclei, Interplanetary Medium, Meteoroids, Zodiacal Dust, Computational Astrophysics, Particle Size Distribution, Temporal Distribution, Comets, Bennett, Meteoroids, Source, Origin, Astronomy, Dust, Ejection, Long-Period Comets, Comae, Particles, Size, Diameter, Velocity, Orbits, Mass, Emissions, Distribution, Grains, Interplanetary Dust, Diagrams, Calculations, Evolution, Time Scale, Parameters
Scientific paper
The author considers the problem of the contribution of dust from long-period comets to the zodiacal cloud. He derives a new general expression, which takes into account the dust ejection velocity from the inner coma, for the diameter of the smallest particles injected into bounded orbits. For the case of ejection at zero-velocity the author confirms previous results (Burns et al., 1979) which state that no dust can be injected into the interplanetary cloud. But the consideration of an ejection velocity different from zero shows that this conclusion, suggested also by Jambor (1976) and Sekanina (1977), is not realistic. The application to the results of the inversion of the Finson-Probstein functional (Fulle, 1986) for the long-period comet Bennett 1970 II, shows that a significant fraction of the dust mass is injected into bounded orbits before the perihelion, whereas almost the whole dust is lost after. The extrapolation of the results to all long-period comets gives an isotropic source of meteoroids larger than ≈0.4 mm with an input mass rate of (0.4-1.5)×106g s-1, quite far from the ≈107g s-1 required by the collisional models of the zodiacal cloud (Grün et al., 1985).
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